[Interest] format of QString

sarah jones qtsarah at outlook.com
Fri Apr 4 15:28:42 CEST 2014


hi
I thought I 'escaped' the dot character by using \\. 
is that not the case?

Date: Fri, 4 Apr 2014 15:21:47 +0200
From: andre at familiesomers.nl
To: qtsarah at outlook.com; interest at qt-project.org
Subject: Re: [Interest] format of QString


  
    
  
  
    sarah jones schreef op 4-4-2014 15:16:

    
    
      
      Hi

        I have tried this regular expression -

        

        QRegularExpression
        expression("^[cfmt]_\\d\\d\\d\\d\\d\\d\\.rcd$");

            

        if (expression.match(receivedFilename).hasMatch());

        

        this finds a match for m_000006.rcd

        

        but unfortunately it also matches m_0000006.rcd

        

        and I cannot figure out why

        I have tried this in some of the online regular expression tools
        and it seems to work there

        What have I got wrong?

        

      
    
    A dot is not treated as a literal character . but as an operator.

    http://www.regular-expressions.info/dot.html

    

    For readabiliy, I'd not use \\d 6 times, but simply use [\\d]{6}
    instead. 

    

    André

    

    

    
      Thanks

        

        Sarah

        

        > Date: Fri, 4 Apr 2014 13:58:10 +0200

          > From: andre at familiesomers.nl

          > To: interest at qt-project.org

          > Subject: Re: [Interest] format of QString

          > 

          > R. Reucher schreef op 4-4-2014 13:47:

          > > A slight modification to your proposed reg-exp:

          > >

          > > QRegExp regExp("(m|c)_([0-9]{6})\\.rcp");

          > 

          > For new (Qt 5) code, I really recommend using
          QRegularExpression instead 

          > of QRegExp where possible.

          > 

          > André

          > 

          > >

          > > Regards, René

          > >

          > > On Friday 04 April 2014 13:25:36 Etienne
          Sandré-Chardonnal wrote:

          > >> Hi sarah,

          > >>

          > >> This is untested but should work:

          > >>

          > >> QRegExp regExp("(m|c)_([0-9]{6}).rcp");

          > >> if(regExp.exactMatch(fileName))

          > >> {

          > >> //Here we know that filename matches the pattern

          > >> QString letter = regExp.cap(1); //Will be "m" or
          "c"

          > >> QString number = regExp.cap(2); //Will contain
          the six digits as a

          > >> string

          > >> }

          > >>

          > >>

          > >> Regular expressions are a vast topic, you will
          find a lot of documentation

          > >> by googling it.

          > >>

          > >>

          > >> Etienne

          > >>

          > >> 2014-04-04 13:01 GMT+02:00 André Somers
          <andre at familiesomers.nl>:

          > >>> sarah jones schreef op 4-4-2014 12:47:

          > >>> Hi

          > >>> How would you advise that I ensure a QString
          object is of a given format.

          > >>> In particular I want to check that a QString
          conforms to the following

          > >>> m_ or c_

          > >>> followed by 6 digits (0-9)

          > >>> followed by ".rcd"

          > >>>

          > >>> so m_000001.rcd matches as does c_000003.rcd

          > >>> but not m_aa00002.rcd

          > >>> etc

          > >>>

          > >>> A regular expression sounds like the right
          tool for that. See

          > >>> QRegularExpression (Qt5) or QRegExp (Qt4).

          > >>>

          > >>> André

          > >>>

          > >>>

          > >>>
          _______________________________________________

          > >>> Interest mailing list

          > >>> Interest at qt-project.org

          > >>>
          http://lists.qt-project.org/mailman/listinfo/interest

          > > _______________________________________________

          > > Interest mailing list

          > > Interest at qt-project.org

          > >
          http://lists.qt-project.org/mailman/listinfo/interest

          > 

          > _______________________________________________

          > Interest mailing list

          > Interest at qt-project.org

          > http://lists.qt-project.org/mailman/listinfo/interest

        
      
    
    
 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.qt-project.org/pipermail/interest/attachments/20140404/6cdd3a45/attachment.html>


More information about the Interest mailing list